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Name:    Chapter 1 Review

Multiple Choice Identify the letter of the choice that best completes the statement or answers the question.
A B C D	1.	Counting the number of organisms in a small area and multiplying to estimate the number in a larger area is called a. direct observation. b. mark and recapture. c. population density. d. sampling.
A B C D	2.	A close relationship between two species that benefits at least one of the species is called a. natural selection. b. symbiosis. c. adaptation. d. competition.
A B C D	3.	An organism’s habitat must provide all of the following EXCEPT a. food. b. water. c. predators. d. shelter.
A B C D	4.	Population density is defined as a. an approximation of a number, based on reasonable assumptions. b. the number of individuals of a population in a specific area. c. the number of individuals moving into a population. d. the smallest level of ecological organization.
A B C D	5.	A hawk building its nest on an arm of a saguaro cactus is an example of a. commensalism. b. mutualism. c. parasitism. d. predation.
Modified True/False Indicate whether the sentence or statement is true or false.  If false, change the identified word or phrase to make the sentence or statement true.
T F	6.	A tapeworm living inside a wolf’s body is a predator. _________________________
T F	7.	All of the members of a community belong to the same species. _________________________
T F	8.	Bees and flowers are biotic factors in an ecosystem. _________________________
T F	9.	An insect looks like a leaf, so it blends in with its surroundings and is hard for predators to see. The insect’s characteristic is an example of commensalism. _________________________
T F	10.	In predation, the organism that kills another organism for food is the prey. _________________________
Completion Complete each sentence or statement.
	11.	All the biotic and abiotic factors in an area together make up a(n) ____________________.
	12.	Two abiotic factors that are needed for photosynthesis are sunlight and ____________________.
	13.	The ____________________ method of estimating involves multiplying the number of organisms in a small area to find the number in a larger area.
	14.	The thick fur of a polar bear is a(n) ____________________ that allows the bear to live successfully in its environment.
	15.	A flea is a parasite that lives on a(n) ____________________ such as a dog.
Short Answer
		Use the diagram to answer each question.
	16.	Describe two things the prairie dogs need to live that they obtain from their habitat.
	17.	What is the smallest unit of organization in an ecosystem? Give one example from the diagram.
	18.	What level of ecological organization do all of the owls in a certain area represent?
	19.	Is the prairie soil a biotic factor or an abiotic factor? Explain your answer.
		Use the diagram to answer each question.
	20.	What happened to the pheasant population between Point B and Point C?
Essay
	21.	Classify these examples of symbiosis by type and explain your choice: 1) Inside a human’s intestine live bacteria that make vitamin K; 2) A human picks up bacteria on his or her hands. The bacteria do not cause disease but do feed on the human’s dead skin cells; 3) A tick attaches itself to a human and feeds on the human’s blood.